linux-kernel - Re: [PATCH v3 0/4] tpm/tpm_crb: implement power management.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20160914160652.GA12158@intel.com>
Date:   Wed, 14 Sep 2016 19:06:55 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     "Winkler, Tomas" <tomas.winkler@...el.com>
Cc:     "jgunthorpe@...idianresearch.com" <jgunthorpe@...idianresearch.com>,
        "tpmdd-devel@...ts.sourceforge.net" 
        <tpmdd-devel@...ts.sourceforge.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 0/4] tpm/tpm_crb: implement power management.

On Wed, Sep 14, 2016 at 07:06:02PM +0300, Jarkko Sakkinen wrote:
> On Wed, Sep 14, 2016 at 06:28:03AM +0000, Winkler, Tomas wrote:
> > On Mon, 2016-09-12 at 16:04 +0300, Tomas Winkler wrote:
> > > Te overall platform ability to enter a low power state is also
> > > conditioned on the ability of a tpm device to go to idle state.
> > > This series should provide this feature.
> > > 
> > > Unfortunately, there is a HW bug on Intel PTT devices on Skylake,
> > > Kabylake, and Broxton devices, where certain registers lost retention
> > > during TPM idle state. Hence this implementation takes this into
> > > consideration and implement the feature based only on access to
> > > registers that retain their state. This still conforms to the spec
> > > and should be correct also on non Intle devices.
> > > 
> > > V2: Utilize runtime_pm for driving tpm crb idle states.
> > > V3. fix lower case corruption in the first patch
> > > 
> > Jarkko, had you chance to test v3 series one on your side, is this okay
> > to go?
> 
> Opens for me are:
> 
> - pm_runtime_put_sync() is still used 
> - callback names
> - wait_for_tpm_stat

I also tested v3 and it works for me.

/Jarkko